PIC14C000. Errata Sheet for PIC14C000 Revision A. USING THE I 2 C MODULE IN SMBus MODE USING AN1 AND AN5 AS ANALOG INPUTS
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1 Errata Sheet for PIC14C000 Revision A The PIC14C000 parts you have received conform functionally to the PIC14C000 data sheet (DS40122B), except for the anomalies described below. USING AN1 AND AN5 AS ANALOG INPUTS 1. Analog inputs AN1 and AN5 can not be used if their level-shift network is disabled. According to Section 9.2 of the PIC14C000 data sheet, (DS40122B), the level-shift network feature can be turned off by setting the LSOFF bit (SLPCON<4>). However, doing so will cause the AN1 and AN5 inputs to go to VDD, rendering them unusable as analog input channels. Therefore, the LSOFF bit must remain cleared. The other functions associated with these pins, such as the current zeroing and filtering switches, operate as specified. The AN1 and AN5 pins can still be used for ADC operations, but a small firmware routine is required to ensure accurate results. This routine can be implemented by following the steps below: Ensure the LSOFF bit (SLPCON<4>) is cleared. Ensure a good zero-level on AN1 and/or AN5 by setting the ADZERO bit (ADCON0<0>). Perform an A/D conversion as normal and keep the count from ADCAPH and ADCAPL in userdefined RAM. This is the representative digital count for the exact level-shift value. Enable the signal of interest onto AN1 and/or AN5. Perform another A/D conversion and keep the count in ADCAPH and ADCAPL. This is the representative digital count for the sum of the signal of interest and the exact level-shift value. Subtract the level-shift count from the representative count for the sum. This result will be the representative count for the signal of interest alone. USING THE I 2 C MODULE IN SMBus MODE 2. The I 2 C Module in the PIC14C000 can be used with either PORTC<7:6> or PORTD<1:0> to provide the clock and data signal connections. According to Figure 7-16 of the PIC14C000 data sheet (DS40122B), the MISC<bit 3>, SMBus bit, allows user to select the input thresholds of PORTC<7:6> and PORTD<1:0> to either be SMBus-compatible or Schmitt Trigger-compatible. Although the data sheet says that PORTC<7:6> operates the same way as PORTD<1:0>, in the actual implementation, PORTC<7:6> always uses the Schmitt Trigger input thresholds when the I 2 C module reads through PORTC<7:6>, even if the SMBus mode is selected. If PORTC<7:6> are read as port inputs, while the SMBus mode is selected, the SMBus voltage levels are used. Interfacing to an SMBus port can still be implemented using either of the following methods: Use the I 2 C module together with PORTD<1:0>, and set the MISC<3> bit high. Use PORTC<7:6> or PORTD<1:0> with the MISC<3> bit set high, and perform the I 2 C function in firmware Microchip Technology Inc. DS80057A-page 1
2 Clarifications/Corrections to the Data Sheet: In the PIC14C000 Device Data Sheet (document DS40122B), the following clarifications and corrections should be noted: 1. Module: A/D The operating current specifications during SLEEP have been modified to the values shown in Table 1. TABLE 1: A/D CONVERTER OPERATING CURRENT DURING SLEEP MODE IPD1 IPD1 During A/D conversion: All analog on and internal oscillator active TBD TBD µa µa VDD = 3.0V VDD = 4.0V 2. Module: I/O Port The Input High Voltage specification for the RC7, RC6, RD1, and RD0 in the SMBus mode has been modified to the values shown in Table 2. TABLE 2: RC7, RC6, RD1, RD0 INPUT HIGH VOLTAGE VIH SMBus mode (RC7, RC6, RD0, RD1) V VDD V SMBus bit, MISC<3> = 1 3. MCLR Reset The MCLR reset specification has been modified to the values shown in Table 3. TABLE 3: MCLR RESET TIMING TmcL MCLR Pulse Width (low) µs VDD = 5V, -40 C to +85 C TIOZ I/O High Impedance from MCLR Low µs DS80057A-page Microchip Technology Inc.
3 4. Module: Bandgap Voltage Reference The condition for the Output Voltage specification has been added as shown in Table 4. TABLE 4: BANDGAP OUTPUT VOLTAGE SPECIFICATION VO(VREF) Output Voltage V TA = 25 C 5. Module: Temperature Sensor The Output linearity specification has been modified to the values shown in Table 5. TABLE 5: TEMPERATURE SENSOR SPECIFICATION LIN (temp) Output Linearity (Note 1, 2) 0.5 TBD C Note 1: This parameter is characterized but not tested. 2: Linearity is defined as the maximum deviation over temperature from a best fit straight line. 6. Module: Internal Oscillator The Frequency Range specification has been modified to the values shown in Table 6. TABLE 6: INTERNAL OSCILLATOR FOSC (in) Frequency Range MHz 1999 Microchip Technology Inc. DS80057A-page 3
4 Note the following details of the code protection feature on PICmicro MCUs. The PICmicro family meets the specifications contained in the Microchip Data Sheet. Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet. The person doing so may be engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as unbreakable. Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our product. If you have any further questions about this matter, please contact the local sales office nearest to you. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microid, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dspic, ECONOMONITOR, FanSense, FlexROM, fuzzylab, In-Circuit Serial Programming, ICSP, ICEPIC, microport, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfpic, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July The Company s quality system processes and procedures are QS-9000 compliant for its PICmicro 8-bit MCUs, KEELOQ code hopping devices, Serial EEPROMs and microperipheral products. In addition, Microchip s quality system for the design and manufacture of development systems is ISO 9001 certified Microchip Technology Inc.
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